Trichomanes Elongatum

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Trichomanes elongatum COMMON NAME Bristle fern SYNONYMS Selenodesmium elongatum (A.Cunn.) Copel., Abrodictyum elongatum (A.Cunn.) Ebihara et K.Iwats. FAMILY Hymenophyllaceae AUTHORITY Trichomanes elongatum A.Cunn. FLORA CATEGORY Vascular – Native ENDEMIC TAXON No Long Bay, Coromandel. Photographer: John ENDEMIC GENUS Smith-Dodsworth No ENDEMIC FAMILY No STRUCTURAL CLASS Ferns NVS CODE TRIELO CURRENT CONSERVATION STATUS Long Bay, Coromandel. Photographer: John 2012 | Not Threatened Smith-Dodsworth PREVIOUS CONSERVATION STATUSES 2009 | Not Threatened 2004 | Not Threatened DISTRIBUTION Endemic. New Zealand: North, South and Chatham Islands. Scarce on the Chatham Islands where it is only known from Rekohu (Chatham Islands) HABITAT Coastal to montane in closed and open forest and gumland scrub. Usually on semi-shaded mossy clay banks, in overhangs on rock, soil, clay or along stream side banks. Often in rather dry or seasonally dry, semi-shaded sites. This species appears to resent poorly drained habitats. FEATURES Terrestrial tufted fern. Rhizomes short, stout, erect, bearing numerous dark brown hairs. Fronds submembranous, ± cartilaginous, dark olive-green, adaxially glossy, surfaces often covered in epiphyllous liverworts and mosses. Stipes 50-200 mm long. Rachises winged only near apices. Laminae 60-150 × deltoid, 3-pinnate. Primary and secondary pinnae overlapping, stalked; ultimate segments broad, deeply toothed, the veins forking several times in each. Sori sessile, borne in notches of lamina segments, several on each primary pinnae. Indusia tubular, mouth slightly flared, receptacle exserted. SIMILAR TAXA Easily recognised by the erect rhizome, deltoid, dark olive-green fronds (which often support epiphyllous bryophytes), and by the conspicuous tubular indusia bearing brown hair-like, bristly well exserted receptacles. FLOWERING N.A. FLOWER COLOURS No flowers FRUITING N.A. PROPAGATION TECHNIQUE Difficult - should not be removed from the wild ETYMOLOGY trichomanes: From the ancient Greek name used by Theophrastus and Dioscorides, for a type of fern; refers to the slender hair projecting from each spore case elongatum: Elongate WHERE TO BUY Not commercially available. TAXONOMIC NOTES Previously NZPCN had followed Ebihara et al. (2006) in recognising Abrodictyum as distinct from Trichomanes - recently Brownsey & Perrie (2016) have rejected this idea favouring a return to the past broad circumscription of Trichomanes used in New Zealand. ATTRIBUTION Fact sheet prepared for NZPCN by P.J. de Lange (21 April 2011). Description adapted from Brownsey & Smith- Dodsworth (2000). REFERENCES AND FURTHER READING Brownsey, P.J.; Smith-Dodsworth, J.C. 2000: New Zealand Ferns and Allied Plants. Auckland, David Bateman Brownsey, P.J. & Perrie, L.R. 2016: Hymenophyllaceae. In: Breitwieser, I.; Heenan, P.B.; Wilton, A.D. Flora of New Zealand - Ferns and Lycophytes. Fascicle 15. Manaaki Whenua Press, Lincoln. Ebihara, A.; Dubuisson, J-Y.; Iwatsuki, K.; Hennequin, S.; Ito, M. 2006: A taxonomic revision of the Hymenophyllaceae. Blumea 51: 2-57 CITATION Please cite as: de Lange, P.J. (Year at time of access): Trichomanes elongatum Fact Sheet (content continuously updated). New Zealand Plant Conservation Network. https://www.nzpcn.org.nz/flora/species/trichomanes-elongatum/ (Date website was queried) MORE INFORMATION https://www.nzpcn.org.nz/flora/species/trichomanes-elongatum/.

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A Taxonomic Revision of Hymenophyllaceae
BLUMEA 51: 221–280 Published on 27 July 2006 http://dx.doi.org/10.3767/000651906X622210 A TAXONOMIC REVISION OF HYMENOPHYLLACEAE ATSUSHI EBIHARA1, 2, JEAN-YVES DUBUISSON3, KUNIO IWATSUKI4, SABINE HENNEQUIN3 & MOTOMI ITO1 SUMMARY A new classification of Hymenophyllaceae, consisting of nine genera (Hymenophyllum, Didymoglos- sum, Crepidomanes, Polyphlebium, Vandenboschia, Abrodictyum, Trichomanes, Cephalomanes and Callistopteris) is proposed. Every genus, subgenus and section chiefly corresponds to the mono- phyletic group elucidated in molecular phylogenetic analyses based on chloroplast sequences. Brief descriptions and keys to the higher taxa are given, and their representative members are enumerated, including some new combinations. Key words: filmy ferns, Hymenophyllaceae, Hymenophyllum, Trichomanes. INTRODUCTION The Hymenophyllaceae, or ‘filmy ferns’, is the largest basal family of leptosporangiate ferns and comprises around 600 species (Iwatsuki, 1990). Members are easily distin- guished by their usually single-cell-thick laminae, and the monophyly of the family has not been questioned. The intrafamilial classification of the family, on the other hand, is highly controversial – several fundamentally different classifications are used by indi- vidual researchers and/or areas. Traditionally, only two genera – Hymenophyllum with bivalved involucres and Trichomanes with tubular involucres – have been recognized in this family. This scheme was expanded by Morton (1968) who hierarchically placed many subgenera, sections and subsections under
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